离子液体溶剂浮选法分离富集盐湖卤水中的锂

首次将疏水性离子液体(IL)1-辛基-3-甲基咪唑六氟磷酸盐应用于溶剂浮选,对盐湖卤水中的锂进行富集分离,用火焰原子吸收光谱法对锂进行测定。考察了磷酸三丁酯(TBP)用量、相比V(O):V(A)、浮选时间、气体流速、浮选温度、共存离子、溶液的pH值对浮选率的影响。结果表明,最佳浮选条件为:浮选温度40℃,V(TBP):V(IL)=8:1,相比V(O):V(A)=5,气体流速为50 mL/min,溶液pH=2.5时浮选15 min,此时Li+的浮选率达到85%。离子液体作为浮选剂用来浮选Li+也适用于痕量锂的分析检测。

Separation and enrichment of lithium in the salt lake brine by ionic liquid solvent flotation

Ionic liquid(1-octyl-3-methyl imidazolium hexafluorophosphate) was used as solvent in solvent flotation for separation and enrichment of lithium in the salt lake brine,for the first time,and flame atomic absorption spectrometry was used for the determination of lithium.The experimental conditions were researched and optimized,such as the volume of tributyl phosphate(TBP),the ratio of organic phase to aqueous phase V(O)∶ V(A),flotation time,gas flow rate,flotation temperature and pH of solution.The optimum conditions of flotation were:T=40 ℃,V(TBP)∶ V(IL)=8∶ 1,V(O)∶ V(A)=5,pH=2.5,gas flow rate was 50 mL/min,flotation time was 15 min.Under these conditions,the flotation rate of lithium can reach 85%.This method was also applied to analyze the trace lithium.